#pragma once

#include "../server.hpp"
#include <fstream>
#include <sys/stat.h>
#include <regex>
#include <vector>
#include <string>

const int DEFALT_TIMEOUT = 10;

std::unordered_map<int,std::string> _statu_msg = 
{
    {100,  "Continue"},
    {101,  "Switching Protocol"},
    {102,  "Processing"},
    {103,  "Early Hints"},
    {200,  "OK"},
    {201,  "Created"},
    {202,  "Accepted"},
    {203,  "Non-Authoritative Information"},
    {204,  "No Content"},
    {205,  "Reset Content"},
    {206,  "Partial Content"},
    {207,  "Multi-Status"},
    {208,  "Already Reported"},
    {226,  "IM Used"},
    {300,  "Multiple Choice"},
    {301,  "Moved Permanently"},
    {302,  "Found"},
    {303,  "See Other"},
    {304,  "Not Modified"},
    {305,  "Use Proxy"},
    {306,  "unused"},
    {307,  "Temporary Redirect"},
    {308,  "Permanent Redirect"},
    {400,  "Bad Request"},
    {401,  "Unauthorized"},
    {402,  "Payment Required"},
    {403,  "Forbidden"},
    {404,  "Not Found"},
    {405,  "Method Not Allowed"},
    {406,  "Not Acceptable"},
    {407,  "Proxy Authentication Required"},
    {408,  "Request Timeout"},
    {409,  "Conflict"},
    {410,  "Gone"},
    {411,  "Length Required"},
    {412,  "Precondition Failed"},
    {413,  "Payload Too Large"},
    {414,  "URI Too Long"},
    {415,  "Unsupported Media Type"},
    {416,  "Range Not Satisfiable"},
    {417,  "Expectation Failed"},
    {418,  "I'm a teapot"},
    {421,  "Misdirected Request"},
    {422,  "Unprocessable Entity"},
    {423,  "Locked"},
    {424,  "Failed Dependency"},
    {425,  "Too Early"},
    {426,  "Upgrade Required"},
    {428,  "Precondition Required"},
    {429,  "Too Many Requests"},
    {431,  "Request Header Fields Too Large"},
    {451,  "Unavailable For Legal Reasons"},
    {501,  "Not Implemented"},
    {502,  "Bad Gateway"},
    {503,  "Service Unavailable"},
    {504,  "Gateway Timeout"},
    {505,  "HTTP Version Not Supported"},
    {506,  "Variant Also Negotiates"},
    {507,  "Insufficient Storage"},
    {508,  "Loop Detected"},
    {510,  "Not Extended"},
    {511,  "Network Authentication Required"}
};

std::unordered_map<std::string,std::string> _mime_msg = 
{
    {".aac",        "audio/aac"},
    {".abw",        "application/x-abiword"},
    {".arc",        "application/x-freearc"},
    {".avi",        "video/x-msvideo"},
    {".azw",        "application/vnd.amazon.ebook"},
    {".bin",        "application/octet-stream"},
    {".bmp",        "image/bmp"},
    {".bz",         "application/x-bzip"},
    {".bz2",        "application/x-bzip2"},
    {".csh",        "application/x-csh"},
    {".css",        "text/css"},
    {".csv",        "text/csv"},
    {".doc",        "application/msword"},
    {".docx",       "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
    {".eot",        "application/vnd.ms-fontobject"},
    {".epub",       "application/epub+zip"},
    {".gif",        "image/gif"},
    {".htm",        "text/html"},
    {".html",       "text/html"},
    {".ico",        "image/vnd.microsoft.icon"},
    {".ics",        "text/calendar"},
    {".jar",        "application/java-archive"},
    {".jpeg",       "image/jpeg"},
    {".jpg",        "image/jpeg"},
    {".js",         "text/javascript"},
    {".json",       "application/json"},
    {".jsonld",     "application/ld+json"},
    {".mid",        "audio/midi"},
    {".midi",       "audio/x-midi"},
    {".mjs",        "text/javascript"},
    {".mp3",        "audio/mpeg"},
    {".mpeg",       "video/mpeg"},
    {".mpkg",       "application/vnd.apple.installer+xml"},
    {".odp",        "application/vnd.oasis.opendocument.presentation"},
    {".ods",        "application/vnd.oasis.opendocument.spreadsheet"},
    {".odt",        "application/vnd.oasis.opendocument.text"},
    {".oga",        "audio/ogg"},
    {".ogv",        "video/ogg"},
    {".ogx",        "application/ogg"},
    {".otf",        "font/otf"},
    {".png",        "image/png"},
    {".pdf",        "application/pdf"},
    {".ppt",        "application/vnd.ms-powerpoint"},
    {".pptx",       "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
    {".rar",        "application/x-rar-compressed"},
    {".rtf",        "application/rtf"},
    {".sh",         "application/x-sh"},
    {".svg",        "image/svg+xml"},
    {".swf",        "application/x-shockwave-flash"},
    {".tar",        "application/x-tar"},
    {".tif",        "image/tiff"},
    {".tiff",       "image/tiff"},
    {".ttf",        "font/ttf"},
    {".txt",        "text/plain"},
    {".vsd",        "application/vnd.visio"},
    {".wav",        "audio/wav"},
    {".weba",       "audio/webm"},
    {".webm",       "video/webm"},
    {".webp",       "image/webp"},
    {".woff",       "font/woff"},
    {".woff2",      "font/woff2"},
    {".xhtml",      "application/xhtml+xml"},
    {".xls",        "application/vnd.ms-excel"},
    {".xlsx",       "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
    {".xml",        "application/xml"},
    {".xul",        "application/vnd.mozilla.xul+xml"},
    {".zip",        "application/zip"},
    {".3gp",        "video/3gpp"},
    {".3g2",        "video/3gpp2"},
    {".7z",         "application/x-7z-compressed"}
};

class Util
{
public:
    //字符串分割函数
    //将src字符串按照sep字符进行分割，得到的各个字符串放在arry中,返回字符串的数量
    static size_t Split(const std::string& src,const std::string& sep,std::vector<std::string>* arry)
    {
        size_t offset = 0;
        //offset是查找的起始位置
        while(offset < src.size())
        {
            size_t pos = src.find(sep,offset);
            if(pos == std::string::npos)
            {
                //没找到
                //将剩余部分作为一个子串，放入arry中
                if(pos == src.size()) break;
                arry->push_back(src.substr(offset));
                return arry->size();
            }
            //分隔符连续存在
            if(pos == offset)
            {
                offset = pos + sep.size();
                continue;
            }
            arry->push_back(src.substr(offset,pos - offset));
            offset = pos + sep.size();
        }
        return arry->size();
    }
    //读取文件所以内容，放入一个buffer中
    static bool ReadFile(const std::string& filename,std::string* buf)
    {
        std::ifstream ifs(filename,std::ios::binary);
        if(ifs.is_open() == false)
        {
            ERR_LOG("OPEN: %s FILE FAILED!!",filename.c_str());
            return false;
        }

        size_t fsize = 0;
        ifs.seekg(0,ifs.end);   //跳到文件末尾
        fsize = ifs.tellg();    //获取当前读写位置相当于起始位置的偏移量，现在就是文件大小
        ifs.seekg(0,ifs.beg);   //回到起始位置
        buf->resize(fsize);
        ifs.read(&(*buf)[0],fsize);
        if(ifs.good() == false)
        {
            ERR_LOG("READ %s FILE FAILED!!",filename.c_str());
            ifs.close();
            return false;
        }
        ifs.close();
        return true;
    }
    //向文件写入数据
    static bool WriteFile(const std::string& filename,const std::string& buf)
    {
        //有文件就清空，重新写入，没有就创建
        std::ofstream ofs(filename,std::ios::binary | std::ios::trunc);
        if(ofs.is_open() == false)
        {
            ERR_LOG("OPEN: %s FILE FAILED!!",filename.c_str());
            return false;
        }
        ofs.write(buf.c_str(),buf.size());
        if(ofs.good() == false)
        {
            ERR_LOG("WRITE %s FILE FAILED!!",filename.c_str());
            ofs.close();
            return false;            
        }
        ofs.close();
        return true;
    }
    //URL编码
    //URL编码，避免URL中资源路径与查询字符串中的特殊字符与HTTP请求中特殊字符产生歧义
    //编码格式：将特殊字符的ascii值，转换为两个16进制字符，前缀%   C++ -> C%2B%2B
    //  不编码的特殊字符： RFC3986文档规定 . - _ ~ 字母，数字属于绝对不编码字符
    //RFC3986文档规定，编码格式 %HH 
    //W3C标准中规定，查询字符串中的空格，需要编码为+， 解码则是+转空格
    static std::string UrlEncode(const std::string url,bool convert_space_to_plus)
    {
        std::string res;
        for(auto& c : url)
        {
            if(c == '.' || c == '_' || c == '-' || c == '~' || isalnum(c))
            {
                res += c;
                continue;
            }
            if(c == ' ' && convert_space_to_plus)
            {
                res += '+';
                continue;
            }
            //剩下的都要转换为%HH格式
            char tmp[4] = {0};
            //snprintf 与 printf比较类似，都是格式化字符串，只不过一个是打印，一个是放到一块空间中
            snprintf(tmp,4,"%%%02X",c);
            res += tmp;
        }
        return res;
    }

    static char HEXTOI(char c)
    {
        if(c >= '0' && c <= '9')
        {
            return c - '0';
        }
        else if(c >= 'a' && c <= 'z')
        {
            return c - 'a' + 10;
        }
        else if(c >= 'A' && c <= 'Z')
        {
            return c - 'A' + 10;
        }
        return ' ';
    }

    //URL解码
    static std::string UrlDecode(const std::string url,bool convert_plus_to_space)
    {
        //遇到%就将后面两个字符转换为数字，第一个左移4位再加上第二个
        std::string res;
        for(int i = 0;i < url.size();i++)
        {
            if(url[i] == '+' && convert_plus_to_space)
            {
                res += ' ';
                continue;
            }
            if(url[i] == '%' && (i + 2) < url.size())
            {
                char v1 = HEXTOI(url[i+1]);
                char v2 = HEXTOI(url[i+2]);
                char v = (v1 << 4) + v2;
                res += v;
                i += 2;
                continue;
            }
            res += url[i];
        }
        return res;
    }
    //响应状态码的描述信息获取
    static std::string StatuDesc(int statu)
    {
        auto it = _statu_msg.find(statu);
        if(it != _statu_msg.end())
        {
            return it->second;
        }
        return "Unknow";
    }
    //根据文件后缀名获取文件mime
    static std::string ExtMime(const std::string& filename)
    {
        //先获取文件拓展名
        size_t pos = filename.find_last_of('.');
        if(pos == std::string::npos)
        {
            return "application/octet-stream";
        }
        //根据拓展名获取mime
        std::string ext = filename.substr(pos);
        auto it = _mime_msg.find(ext);
        if(it == _mime_msg.end())
        {
            return "application/octet-stream";
        }
        return it->second;
    }
    //判断一个文件是否是一个目录
    static bool IsDirectory(const std::string& filename)
    {
        struct stat st;
        int ret = stat(filename.c_str(),&st);
        if(ret < 0)
        {
            return false;
        }
        return S_ISDIR(st.st_mode);
    }
    //判断一个文件是否一个普通文件
    static bool IsRegular(const std::string& filename)
    {
        struct stat st;
        int ret = stat(filename.c_str(),&st);
        if(ret < 0)
        {
            return false;
        }
        return S_ISREG(st.st_mode);
    }
    //http请求资源路径是否有效
    static bool ValidPath(const std::string& path)
    {
        //思想：按照/进行路径分割，根据有多少子目录，计算目录深度，有多少层，深度不能小于0
        std::vector<std::string> subdir;
        Split(path,"/",&subdir);
        int level = 0;
        for(auto& dir : subdir)
        {
            if(dir == "..")
            {
                level--;
                if(level < 0)
                {
                    return false;
                }
                continue;
            }
            level++;
        }
        return true;
    }
};

class HttpRequest
{
public:
    std::string _method;        //请求方法
    std::string _path;          //资源路径
    std::string _version;       //协议版本
    std::string _body;           //请求正文
    std::smatch _matches;       //资源路径的正则提取数据
    std::unordered_map<std::string,std::string> _headers;   //头部字段
    std::unordered_map<std::string,std::string> _params;    //查询字符串

public:
    HttpRequest()
        :_version("HTTP/1.1")
    {}
    void ReSet()
    {
        _method.clear();
        _path.clear();
        _version = "HTTP/1.1";
        _body.clear();
        std::smatch match;
        _matches.swap(match);
        _headers.clear();
        _params.clear();
    }
    //插入头部字段
    void SetHeader(const std::string& key,const std::string& val)
    {
        _headers.insert(make_pair(key,val));
    }
    //判断是否存在指定头部字段
    bool HasHeader(const std::string& key) const
    {
        auto it = _headers.find(key);
        if(it == _headers.end())
        {
            return false;
        }
        return true;
    }
    //获取指定头部字段的值
    std::string GetHeader(const std::string& key) const
    {
        auto it = _headers.find(key);
        if(it == _headers.end())
        {
            return "";
        }
        return it->second;
    }
    //插入查询字符串
    void SetParam(const std::string& key,const std::string& val)
    {
        _params.insert(make_pair(key,val));
    }
    //判断是否存在某个指定的查询字符串
    bool HasParam(const std::string& key) const
    {
        auto it = _params.find(key);
        if(it == _params.end())
        {
            return false;
        }
        return true;
    }
    //获取指定查询字符串 
    std::string GetParam(const std::string& key) const 
    {
        auto it = _params.find(key);
        if(it == _params.end())
        {
            return "";
        }
        return it->second;
    }
    //获取正文长度
    size_t ContentLength() const 
    {
        bool ret = HasHeader("Content-Length");
        if(ret == false)
        {
            return 0;
        }
        std::string len = GetHeader("Content-Length");
        return std::stol(len);
    }
    //判断是否是短链接
    bool Close() const
    {
        // 没有Connection字段，或者有Connection但是值是close，则都是短链接，否则就是长连接
        if(HasHeader("Connection") && GetHeader("Connection") == "keep-alive")
        {
            return false;
        }
        return true;
    }
};


class HttpResponse
{
public:
    int _statu;
    bool _redirect_flag;        //是否重定向
    std::string _redirect_url;  //重定向url
    std::string _body;
    std::unordered_map<std::string,std::string> _headers;

public:
    HttpResponse()
        :_redirect_flag(false)
        ,_statu(200)
    {}
    HttpResponse(int statu)
        :_redirect_flag(false)
        ,_statu(statu)
    {}
    void ReSet();
    //插入头部字段
    void SetHeader(const std::string& key,const std::string& val)
    {
        _headers.insert(make_pair(key,val));
    }
    //判断是否存在指定头部字段
    bool HasHeader(const std::string& key)
    {
        auto it = _headers.find(key);
        if(it == _headers.end())
        {
            return false;
        }
        return true;
    }
    //获取指定头部字段的值
    std::string GetHeader(const std::string& key)
    {
        auto it = _headers.find(key);
        if(it == _headers.end())
        {
            return "";
        }
        return it->second;
    }

    //设置正文
    void SetContent(const std::string& body,const std::string& type = "text/html")
    {
        _body = body;
        SetHeader("Conten-Type",type);
    }
    //设置重定向
    void SetRedirect(const std::string& url,int statu = 302)
    {
        _statu = statu;
        _redirect_flag = true;
        _redirect_url = url;
    }
    //判断是否是短链接
    bool Close()
    {
        // 没有Connection字段，或者有Connection但是值是close，则都是短链接，否则就是长连接
        if(HasHeader("Connection") && GetHeader("Connection") == "keep-alive")
        {
            return false;
        }
        return true;
    }
};

typedef enum
{
    RECV_HTTP_ERROR,
    RECV_HTTP_LINE,
    RECV_HTTP_HEAD,
    RECV_HTTP_BODY,
    RECV_HTTP_OVER
}HttpRecvStatu;

const int MAX_LINE = 8192;
class HttpContext
{
private:
    int _resp_statu;            //响应状态码
    HttpRecvStatu _recv_statu;  //当前接收及解析的阶段状态
    HttpRequest _request;       //已经接收得到的请求信息

private:
    //解析请求行
    bool ParseHttpLine(std::string& line)
    {
        //去掉末尾的回车换行
        if(line.back() == '\n')
        {
            line.pop_back();
        }
        if(line.back() == '\r')
        {
            line.pop_back();
        }
        std::smatch matches;
        std::regex e("(GET|HEAD|POST|PUT|DELETE) ([^?]*)(?:\\?(.*))? (HTTP/1\\.[01])(?:\n|\r\n)?", std::regex::icase);
        bool ret = std::regex_match(line,matches,e);
        if(ret == false)
        {
            _recv_statu = RECV_HTTP_ERROR;
            _resp_statu = 400;//BAD REQUEST
            return false;
        }
        // 0 下标是原字符串
        _request._method = matches[1];
        //可能出现小写，转一下大写
        std::transform(_request._method.begin(),_request._method.end(),_request._method.begin(), ::toupper);
        //资源路径的获取，需要URL解码，但不需要+转空格
        _request._path = Util::UrlDecode(matches[2],false);
        //协议版本
        _request._version = matches[4];
        //查询字符串处理与获取
        std::vector<std::string> query_string_arry;
        std::string query_string = matches[3];
        //查询字符串格式key=val&key=val，先以&分割
        Util::Split(query_string,"&",&query_string_arry);
        //针对各个字符串，以= 分割,得到key和val后还需要解码
        for(auto& str:query_string_arry)
        {
            auto pos = str.find("=");
            if(pos = str.npos)
            {
                _recv_statu = RECV_HTTP_ERROR;
                _resp_statu = 400;//BAD REQUEST
                return false;
            }
            std::string key = Util::UrlDecode(str.substr(0,pos),true);
            std::string val = Util::UrlDecode(str.substr(pos + 1),true);
            _request.SetParam(key,val);
        }
        return true;
    }
    //读取请求行
    bool RecvHttpLine(Buffer* buf)
    {
        if(_recv_statu != RECV_HTTP_LINE)
        {
            //不是读取请求行的阶段
            return false;
        }
        //获取一行数据，带有末尾的换行
        std::string line = buf->GetLineAndPop();
        //缓冲区不足一行
        if(line.size() == 0)
        {
            //不足一行，但可读数据很长，很长了但不足一行，有问题
            if(buf->ReadAbleSize() > MAX_LINE)
            {
                _recv_statu = RECV_HTTP_ERROR;
                _resp_statu = 414;//URL TOO LONG
                return false;
            }
            //不足一行但也不多，所以等等新数据到来
            return true;
        }

        if(line.size() > MAX_LINE)
        {
            _recv_statu = RECV_HTTP_ERROR;
            _resp_statu = 414;//URL TOO LONG
            return false;            
        }

        //进行解析请求行
        bool ret = ParseHttpLine(line);
        if(ret == false)
        {
            return false;
        }
        //首行处理完毕，进入头部获取阶段
        _recv_statu = RECV_HTTP_HEAD;
        return true;
    }
    //读取头部信息
    bool RecvHttpHead(Buffer* buf)
    {
        if(_recv_statu != RECV_HTTP_HEAD)
        {
            return false;
        }
        while(1)
        {
            //获取一行数据，带有末尾的换行
            std::string line = buf->GetLineAndPop();
            //缓冲区不足一行
            if(line.size() == 0)
            {
                //不足一行，但可读数据很长，很长了但不足一行，有问题
                if(buf->ReadAbleSize() > MAX_LINE)
                {
                    _recv_statu = RECV_HTTP_ERROR;
                    _resp_statu = 414;//URL TOO LONG
                    return false;
                }
                //不足一行但也不多，所以等等新数据到来
                return true;
            }

            if(line.size() > MAX_LINE)
            {
                _recv_statu = RECV_HTTP_ERROR;
                _resp_statu = 414;//URL TOO LONG
                return false;            
            }

            if(line == "\n" || line == "\r\n")
            {
                //读到空行代表读取结束
                break;
            }
            bool ret = ParseHttpHead(line);
            if(ret == false)
            {
                return false;
            }
        }
        //头部处理完毕,进入正文获取阶段
        _recv_statu = RECV_HTTP_BODY;
        return true;
    }
    //解析头部信息
    bool ParseHttpHead(std::string& line)
    {
        //去掉末尾的换行符
        if(line.back() == '\n')
        {
            line.pop_back();
        }
        if(line.back() == '\r')
        {
            line.pop_back();
        }
        size_t pos = line.find(": ");
        if(pos == line.npos)
        {
            _recv_statu = RECV_HTTP_ERROR;
            _resp_statu = 400;
            return false;
        }
        std::string key = line.substr(0,pos);
        std::string val= line.substr(pos + 2);
        _request.SetHeader(key,val);
        return true;
    }
    //读取正文
    bool RecvHttpBody(Buffer* buf)
    {
        if(_recv_statu != RECV_HTTP_BODY)
        {
            return false;
        }
        //获取正文长度
        size_t content_length = _request.ContentLength();
        if(content_length == 0)
        {
            //没有正文，则解析完毕
            _recv_statu = RECV_HTTP_OVER;
            return true;
        }
        //计算现在实际还需要接收多少正文
        size_t real_len = content_length - _request._body.size();
        //当前缓冲区包含了剩余正文
        if(buf->ReadAbleSize() >= real_len)
        {
            _request._body.append(buf->ReadPosition(),real_len);
            buf->MoveReadOffset(real_len);
            _recv_statu = RECV_HTTP_OVER;
            return true;
        }
        //缓冲区中的数据无法满足完整正文需求，只有部分正文
        _request._body.append(buf->ReadPosition(),buf->ReadAbleSize());
        buf->MoveReadOffset(buf->ReadAbleSize());
        return true;
    }

public:
    HttpContext()
        :_resp_statu(200)
        ,_recv_statu(RECV_HTTP_LINE)
    {}
    void ReSet()
    {
        _resp_statu = 200;
        _recv_statu = RECV_HTTP_LINE;
        _request.ReSet();
    }
    int RespStatu()
    {
        return _resp_statu;
    }
    HttpRecvStatu RecvStatu()
    {
        return _recv_statu;
    }
    HttpRequest& Request()
    {
        return _request;
    }
    //接收并解析HTTP请求
    void RecvHttpRequest(Buffer* buf)
    {
        //不同状态，做不同的事情，但是不需要break，
        //因为处理完请求行后，应该立刻开始处理头部，而不是等待新数据，如果一直没有新数据来，头部信息就一直读不到
        switch(_recv_statu)
        {
            case RECV_HTTP_LINE: RecvHttpLine(buf);
            case RECV_HTTP_HEAD: RecvHttpHead(buf);
            case RECV_HTTP_BODY: RecvHttpBody(buf);
        }
    }
};


class HttpServer
{
private:
    using Handler = std::function<void(const HttpRequest&,HttpResponse*)>;
    using Handlers = std::vector<std::pair<std::regex,Handler>>;
    Handlers _get_route;
    Handlers _post_route;
    Handlers _put_route;
    Handlers _delete_route;
    std::string _basedir;   //静态资源根目录
    TcpServer _server;

private:    
    //填充错误信息
    void ErrorHandler(HttpRequest& req,HttpResponse* rsp)
    {
        //组织一个错误展示页面
        std::string body;
        body += "<html>";
        body += "<head>";
        body += "<meta http-equiv='Content-Type' content='text/html;charset=utf-8'>";
        body += "</head>";
        body += "<body>";
        body += "<h1>";
        body += std::to_string(rsp->_statu);
        body += " ";
        body += Util::StatuDesc(rsp->_statu);
        body += "</h1>";
        body += "</body>";
        body += "</html>";
        //将页面数据当作响应正文,放入rsp
        rsp->SetContent(body,"text/html");
    }
    //将HttpResponse中的要素按照http格式进行组织，发送
    void WriteResponse(const PtrConnection& conn,const HttpRequest& req,HttpResponse& rsp)
    {
        //先完善头部字段
        if(req.Close() == true)
        {
            //  短连接
            rsp.SetHeader("Connection","close");
        }
        else 
        {
            //长连接
            rsp.SetHeader("Connection","keep-alive");
        }

        if(!rsp._body.empty() && !rsp.HasHeader("Content-Length"))
        {
            rsp.SetHeader("Content-Length",std::to_string(rsp._body.size()));
        }
        if(!rsp._body.empty() && !rsp.HasHeader("Content-Type"))
        {
            rsp.SetHeader("Content-Type","application/octet-stream");
        }
        if(rsp._redirect_flag == true)
        {
            rsp.SetHeader("Location",rsp._redirect_url);
        }
        //将rsp中的要素按http协议格式组织
        std::stringstream rsp_str;
        rsp_str << req._version << " " << std::to_string(rsp._statu) << " " << Util::StatuDesc(rsp._statu) << "\r\n";
        for(auto& head:rsp._headers)
        {
            rsp_str << head.first << ": " << head.second << "\r\n";
        }
        rsp_str << "\r\n";
        rsp_str << rsp._body;
        //发送数据
        conn->Send(rsp_str.str().c_str(),rsp_str.str().size());
    }
    //判断静态资源请求
    bool IsFileHandler(HttpRequest& req)
    {
        //必须设置了静态资源根目录
        if(_basedir.empty())
        {
            return false;
        }
        //请求方法必须是GET或者HEAD
        if(req._method != "GET" && req._method != "HEAD")
        {
            return false;
        }
        //请求资源路径必须合法
        if(Util::ValidPath(req._path) == false)
        {
            return false;
        }
        //请求资源必须存在，并且是一个普通文件
        std::string req_path = _basedir + req._path;
        if(req._path.back() == '/')
        {
            req_path += "index.html";
        }
        if(Util::IsRegular(req_path) == false)
        {
            return false;
        }
        return true;
    }
    //静态资源处理
    void FileHandler(HttpRequest& req,HttpResponse* rsp)
    {
        std::string req_path = _basedir + req._path;
        if(req._path.back() == '/')
        {
            req_path += "index.html";
        }

        bool ret = Util::ReadFile(req_path,&rsp->_body);
        if(ret == false)
        {
            return;
        }
        std::string mime = Util::ExtMime(req_path);
        rsp->SetHeader("Content-Type",mime);
        return;
    }
    //功能性请求分类处理
    void Dispatcher(HttpRequest& req,HttpResponse* rsp,Handlers& handlers)
    {
        for(auto& e : handlers)
        {
            const std::regex& re = e.first;
            const Handler& functor = e.second;
            bool ret = std::regex_match(req._path,req._matches,re);
            if(ret == false)
            {
                continue;
            }
            return functor(req,rsp);
        }
        //填充错误码
        rsp->_statu = 404;
    }
    void Route(HttpRequest& req,HttpResponse* rsp)
    {
        //对请求进行分辨，是一个静态资源请求，还是一个功能性请求
        if(IsFileHandler(req) == true)
        {
            return FileHandler(req,rsp);
        }

        if(req._method == "GET" || req._method == "HEAD")
        {
            return Dispatcher(req,rsp,_get_route);
        }
        else if(req._method == "POST")
        {
            return Dispatcher(req,rsp,_post_route);
        }
        else if(req._method == "PUT")
        {
            return Dispatcher(req,rsp,_put_route);
        }
        else if(req._method == "DELETE")
        {
            return Dispatcher(req,rsp,_delete_route);
        }

        //没找到方法
        rsp->_statu = 405; //Method Not Allowed
        return;
    }
    //设置上下文
    void OnConnected(const PtrConnection& conn)
    {
        conn->SetContext(HttpContext());
        DBG_LOG("NEW CONNECTION:%p",conn.get());
    }
    //缓冲区数据处理
    void OnMessage(const PtrConnection& conn,Buffer* buf)
    {
        //缓冲区里面有数据就一直处理
        while(buf->ReadAbleSize() > 0)
        {
            //获取上下文
            HttpContext* context = conn->GetContext()->get<HttpContext>();
            //通过上下文对数据进行解析，得到HttpResponse对象
            //如果解析出错直接回复出错响应
            context->RecvHttpRequest(buf);
            HttpRequest& req = context->Request();
            HttpResponse rsp(context->RespStatu());
            if(context->RespStatu() >= 400)
            {
                //进行错误响应，关闭连接
                //填充错误信息
                ErrorHandler(req,&rsp);
                //组织响应发送给客服端
                WriteResponse(conn,req,rsp);
                context->ReSet();
                //把缓冲区清空
                buf->MoveReadOffset(buf->ReadAbleSize());
                //关闭连接
                conn->Shutdown();
                return ;
            }
            if(context->RecvStatu() != RECV_HTTP_OVER)
            {
                //当前请求还没有接收完整，直接退出，等待新数据到来重新处理
                return;
            }
            //请求路由 + 业务处理
            Route(req,&rsp);
            //对HttpResponse进行组织发送
            WriteResponse(conn,req,rsp);
            //重置上下文
            context->ReSet();
            //根据长短连接判断是否关闭连接
            if(rsp.Close() == true)
            {
                conn->Shutdown();
            }
        }
    }
//this is a test
public:
    HttpServer(int port,int timeout = DEFALT_TIMEOUT)
        :_server(port)
    {
        _server.EnableInactiveRelease(timeout);
        _server.SetConnectedCallback(std::bind(&HttpServer::OnConnected,this,std::placeholders::_1));
        _server.SetMessageCallback(std::bind(&HttpServer::OnMessage,this,std::placeholders::_1,std::placeholders::_2));
    }
    void SetBaseDir(const std::string& path)
    {
        assert(Util::IsDirectory(path) == true);
        _basedir = path;
    }
    //设置/添加，请求（请求的正则表达）与处理函数的映射关系
    void Get(const std::string& pattern,const Handler& handler)
    {
        _get_route.push_back(std::make_pair(std::regex(pattern),handler));
    }
    void Post(const std::string& pattern,const Handler& handler)
    {
        _post_route.push_back(std::make_pair(std::regex(pattern),handler));
    }
    void Put(const std::string& pattern,const Handler& handler)
    {
        _put_route.push_back(std::make_pair(std::regex(pattern),handler));
    }
    void Delete(const std::string& pattern,const Handler& handler)
    {
        _delete_route.push_back(std::make_pair(std::regex(pattern),handler));
    }
    void SetThreadCount(int count)
    {
        _server.SetThreadCount(count);
    }
    void Listen()
    {
        _server.Start();
    }
};
//测试时间